Trap primer diverts a small amount of water from each flush to the floor drain to maintain the water seal Water seal prevents sewer gases from escaping into the air For exposed, top spud toilet flush valves Operates at 1.1 – 1.6 gpf (4.2 - 6.0 Lpf) Includes vacuum breaker, down tube, diverter, 3/8" elbow coupling and exible tube from trap primer to wall. Includes wall flange and coupling kit to connect tubing to 1/2" NPT pipe.